Inherently secured aerogel composites
Embodiments of the present invention describe secured fiber-reinforced aerogels and laminate structures formed therefrom. In one embodiment a laminate comprises at least one fiber-reinforced aerogel layer adjacent to at least one layer of fiber containing material wherein fibers from said at least one fiber-reinforced aerogel layer are interlaced with fibers of said at least one fiber-containing material. In another embodiment a laminate comprises at least two adjacent fiber-reinforced aerogel layers wherein fibers from at least one fiber-reinforced aerogel layer are interlaced with fibers of an adjacent fiber-reinforced aerogel layer.
1. A composite comprising
a first preformed fiber-containing aerogel layer comprising a first fiber reinforcement and a first monolithic aerogel matrix;
a second preformed fiber-containing aerogel layer separate from the first preformed fiber-containing aerogel layer, the second preformed fiber-containing aerogel layer comprising a second fiber reinforcement and a second monolithic aerogel matrix; and
a plurality of tacking sites at an interface between the first and second preformed fiber-containing aerogel layers comprising fibers of the first preformed fiber-containing aerogel layer interlaced with fibers of the second preformed fiber-containing aerogel layer as Z-fibers wherein:
the plurality of tacking sites further comprise local disruptions to the first monolithic aerogel matrix and the second monolithic aerogel matrix; and
the plurality of tacking sites connect the first preformed fiber-containing aerogel layer and the second preformed fiber-containing aerogel layer.
2. The composite of claim 1 , further comprising a third preformed fiber containing aerogel layer that includes a third fiber reinforcement and a third monolithic aerogel matrix, wherein the third preformed fiber-containing aerogel layer is separate from both of the first and second preformed fiber-containing aerogel layers.
3. The composite of claim 1 , wherein the composite further includes at least one layer comprising a fiber-reinforced foam composite.
4. The composite of claim 1 , further comprising a functional layer that is radiation absorbing, radiation reflecting, radar blocking, thermally conductive or electrically conductive.
5. The composite of claim 1 , further comprising a polymeric coating.
6. The composite of claim 1 , wherein one or both of the first monolithic aerogel matrix and the second monolithic aerogel matrix comprises additives.
7. The composite of claim 6 , wherein the additives are selected from the group consisting of opacifying compounds, radiation absorbing compounds, radiation reflecting compounds, thermally conductive components, electrically conductive components, radar blocking components, and combinations thereof.
8. The composite of claim 6 , wherein the additives are selected from the group consisting of B 4 C, Diatomite, Manganese ferrite, MnO, NiO, SnO, Ag 2 O, Bi 2 O 3 , TiC, WC, carbon black, titanium oxide, iron titanium oxide, zirconium silicate, zirconium oxide, iron (I) oxide, iron (III) oxide, manganese dioxide, iron titanium oxide (ilmenite), chromium oxide, silicon carbide and mixtures thereof.